In the battle to build the worlds first useful quantum computers, one company has taken an entirely different approach to the other frontrunners. The conventional approach is to gradually increase the size and power of these devices and test as you go.
But PsiQuantum, a startup based in Palo Alto, California, is gambling on the opposite approach. The company is investing heavily in quantum technologies that are compatible with chip-making fabrication plants that already exist. By using these facilities, their goal is to mass-produce powerful silicon-based quantum computers from the very beginning.
This week, they reveal how well this approach is going and discuss the challenges that still lie ahead.
Founded in 2016, PsiQuantum hit the headlines in 2021 when it raised $700 million to pursue its goal of building useful quantum computers within a decade. This week, it announced a similar injection from the Australian government bring its total funding to some $1.3 billion. That makes it one of the best funded startups in history.
The excitement is largely because of PsiQuantums unique approach. A key decision is its choice of quantum bits or qubits. Other companies are focusing on superconducting qubits, ion traps, neutral atoms, quantum dots and so on.
PsiQuantum has opted to use photons. The advantage is that photons do not easily interact with the environment, so their quantum nature is relatively stable. Thats important for computation.
Paradoxically, this reluctance to interact is also the main disadvantage of photons. Its hard to make them interact with each other in a way that processes information.
But various groups have demonstrated optical quantum computing and PsiQuantum was founded by researchers in this area from Imperial College London and the University of Bristol.
Optical quantum computing works by creating photons or pairs of them, guiding them through channels carved into silicon where they can interact and then measuring their properties with highly specialized detectors.
PsiQuantum intends to do all this with silicon wafers. Their bold idea was that we already know how to make silicon chips on a vast scale by mass-production. Chip fabrication plants cost billions to build so there is a significant advantage in being able to use this current technology.
And by making bigger, more densely packed chips, optical quantum computers can scale relatively easily. Unlike other designs where scaling will be much harder.
So all the focus has been on how to make the manufacture optical quantum computing chips compatible with conventional fabrication plants.
Thats not as easy as it sounds. So this weeks paper outlining their advances has been eagerly awaited.
The team have reached numerous goals. We modified an established silicon photonics manufacturing flow to include high-performance single photon detection and photon pair generation, they say. To our knowledge, this is the first realization of an integrated photonic technology platform capable of on-chip generation, manipulation, and detection of photonic qubits.
But there are significant steps ahead. PsiQuantum still needs to develop a variety of next generation technologies to make large scale photonic quantum computation feasible. It will be necessary to further reduce Silicon Nitride materials and component losses, improve filter performance, and increase detector efficiency to push overall photon loss and fidelity, say the team.
For example, the on-chip photon detectors that are built into waveguides need to be able to count individual photons. The on-chip photon waveguides need to be lower loss. And perhaps the biggest challenge is in developing high speed optoelectronic switches that can rapidly reconfigure optical circuits.
PsiQuantum is making these switches out of barium titanate (BTO), a material that must be incorporated into the fabrication process. We have developed a proprietary process for the growth of high-quality BTO films using molecular beam epitaxy, compatible with foundry processes, they say.
All that looks impressive, but the paper does not include a demonstration of quantum computing itself.
Perhaps its too early to expect that. To be fair, basic quantum computation with photons has long been possible with these kinds of systems at a small scale.
The singular intent of our development is a useful fault-tolerant quantum computer, they say. PsiQuantum has also said elsewhere that its goal is to achieve this by 2029.
Of course, it faces stiff competition from other manufacturers of quantum computers. Itll be an exciting race and the (quantum) clock is ticking.
Ref: A manufacturable platform for photonic quantum computing : arxiv.org/abs/2404.17570
Original post:
The $1 Billion Bet on Quantum Computers That Process Light - DISCOVER Magazine
- Mathematician breaks down how to defend against quantum ... - Phys.Org [Last Updated On: February 28th, 2017] [Originally Added On: February 28th, 2017]
- Here Is Everything You Need to Know About Quantum Computers - Interesting Engineering [Last Updated On: March 18th, 2017] [Originally Added On: March 18th, 2017]
- Quantum Computing Market Forecast 2017-2022 | Market ... [Last Updated On: March 18th, 2017] [Originally Added On: March 18th, 2017]
- What is Quantum Computing? Webopedia Definition [Last Updated On: March 18th, 2017] [Originally Added On: March 18th, 2017]
- Quantum computing is about to disrupt the government contracts market - Bloomberg Government (blog) [Last Updated On: April 22nd, 2017] [Originally Added On: April 22nd, 2017]
- Scientists: We Have Detected the Existence of a Fundamentally New State of Matter - Futurism [Last Updated On: April 22nd, 2017] [Originally Added On: April 22nd, 2017]
- What Sorts Of Problems Are Quantum Computers Good For? - Forbes [Last Updated On: April 22nd, 2017] [Originally Added On: April 22nd, 2017]
- quantum computing - WIRED UK [Last Updated On: April 22nd, 2017] [Originally Added On: April 22nd, 2017]
- Inside Microsoft's 'soup to nuts' quantum computing ramp-up - Computerworld Australia [Last Updated On: April 29th, 2017] [Originally Added On: April 29th, 2017]
- Molecular magnets closer to application in quantum computing - Next Big Future [Last Updated On: May 15th, 2017] [Originally Added On: May 15th, 2017]
- The Bizarre Quantum Test That Could Keep Your Data Secure - WIRED [Last Updated On: May 18th, 2017] [Originally Added On: May 18th, 2017]
- IBM boosts power of quantum computing processors as it lays ... - www.computing.co.uk [Last Updated On: May 22nd, 2017] [Originally Added On: May 22nd, 2017]
- IBM makes leap in quantum computing power - ITworld [Last Updated On: May 22nd, 2017] [Originally Added On: May 22nd, 2017]
- Toward mass-producible quantum computers | MIT News - MIT News [Last Updated On: June 2nd, 2017] [Originally Added On: June 2nd, 2017]
- Purdue, Microsoft Partner On Quantum Computing Research | WBAA - WBAA [Last Updated On: June 2nd, 2017] [Originally Added On: June 2nd, 2017]
- Tektronix AWG Pulls Test into Era of Quantum Computing - Electronic Design [Last Updated On: June 2nd, 2017] [Originally Added On: June 2nd, 2017]
- Google to Achieve "Supremacy" in Quantum Computing by the End of 2017 - Big Think [Last Updated On: July 1st, 2017] [Originally Added On: July 1st, 2017]
- Quantum Computing Becomes More Accessible - Scientific American [Last Updated On: July 1st, 2017] [Originally Added On: July 1st, 2017]
- Qudits: The Real Future of Quantum Computing? - IEEE Spectrum - IEEE Spectrum [Last Updated On: July 1st, 2017] [Originally Added On: July 1st, 2017]
- Alkermes and IBM's quantum computing. Who'll be the big winner? Malcolm Berko - Durham Herald Sun [Last Updated On: July 6th, 2017] [Originally Added On: July 6th, 2017]
- Quantum Computers Made Even More Powerful with New microchip generating 'Qudits' - TrendinTech [Last Updated On: July 8th, 2017] [Originally Added On: July 8th, 2017]
- Quantum Computing Record Broken - Wall Street Pit [Last Updated On: July 8th, 2017] [Originally Added On: July 8th, 2017]
- Technique for measuring and controlling electron state is a ... - UCLA Newsroom [Last Updated On: July 9th, 2017] [Originally Added On: July 9th, 2017]
- Quantum cheques could be a forgery-free way to move money - New Scientist [Last Updated On: July 10th, 2017] [Originally Added On: July 10th, 2017]
- Quantum-computer node uses two different ion species - physicsworld.com [Last Updated On: July 10th, 2017] [Originally Added On: July 10th, 2017]
- Quantum Computers vs Bitcoin How Worried Should We Be? - The Merkle [Last Updated On: July 10th, 2017] [Originally Added On: July 10th, 2017]
- Why you might trust a quantum computer with secretseven over ... - Phys.Org [Last Updated On: July 12th, 2017] [Originally Added On: July 12th, 2017]
- Physicists Take Big Step Towards Quantum Computing and ... - Universe Today [Last Updated On: August 1st, 2017] [Originally Added On: August 1st, 2017]
- Quantum Computing Market Worth 495.3 Million USD by 2023 | 08 ... - Markets Insider [Last Updated On: August 10th, 2017] [Originally Added On: August 10th, 2017]
- China uses a quantum satellite to transmit potentially unhackable data - CNBC [Last Updated On: August 10th, 2017] [Originally Added On: August 10th, 2017]
- Blind quantum computing for everyone - Phys.org - Phys.Org [Last Updated On: August 12th, 2017] [Originally Added On: August 12th, 2017]
- Quantum Computing Is Real, and D-Wave Just Open ... - WIRED [Last Updated On: August 12th, 2017] [Originally Added On: August 12th, 2017]
- Machine learning tackles quantum error correction - Phys.Org [Last Updated On: August 15th, 2017] [Originally Added On: August 15th, 2017]
- Quantum Internet Is 13 Years Away. Wait, What's Quantum Internet? - WIRED [Last Updated On: August 15th, 2017] [Originally Added On: August 15th, 2017]
- Physicists Have Made Exotic Quantum States From Light - Futurism [Last Updated On: August 16th, 2017] [Originally Added On: August 16th, 2017]
- $495.3 Million Quantum Computing Market 2017 by Revenue Source, Application, Industry, and Geography - Global ... - PR Newswire (press release) [Last Updated On: August 18th, 2017] [Originally Added On: August 18th, 2017]
- How quantum mechanics can change computing - The Conversation US [Last Updated On: August 23rd, 2017] [Originally Added On: August 23rd, 2017]
- Introducing Australia's first quantum computing hardware company - Computerworld Australia [Last Updated On: August 23rd, 2017] [Originally Added On: August 23rd, 2017]
- IEEE Approves Standards Project for Quantum Computing ... - insideHPC [Last Updated On: August 23rd, 2017] [Originally Added On: August 23rd, 2017]
- Commonwealth Bank investing in Australia's first quantum computer company - Which-50 (blog) [Last Updated On: August 25th, 2017] [Originally Added On: August 25th, 2017]
- How quantum mechanics can change computing - San Francisco ... - San Francisco Chronicle [Last Updated On: August 25th, 2017] [Originally Added On: August 25th, 2017]
- Quantum Computing Is Coming at Us Fast, So Here's Everything You Need to Know - ScienceAlert [Last Updated On: August 27th, 2017] [Originally Added On: August 27th, 2017]
- Quantum computing event explores the implications for business - Cambridge Network [Last Updated On: August 30th, 2017] [Originally Added On: August 30th, 2017]
- Microsoft's Aussie quantum computing lab set to scale up next-gen ... - ARNnet [Last Updated On: September 7th, 2017] [Originally Added On: September 7th, 2017]
- An Entirely New Type of Quantum Computing Has Just Been Invented - Futurism [Last Updated On: September 7th, 2017] [Originally Added On: September 7th, 2017]
- Microsoft just upped its multi-million bet on quantum computing - ZDNet [Last Updated On: September 7th, 2017] [Originally Added On: September 7th, 2017]
- Here's what quantum computing is and why it matters [Last Updated On: October 6th, 2017] [Originally Added On: October 6th, 2017]
- What will you actually use quantum computing for? | ZDNet [Last Updated On: October 11th, 2017] [Originally Added On: October 11th, 2017]
- Quantum Computing | Intel Newsroom [Last Updated On: October 13th, 2017] [Originally Added On: October 13th, 2017]
- Intel Takes First Steps To Universal Quantum Computing [Last Updated On: October 13th, 2017] [Originally Added On: October 13th, 2017]
- Qudits: The Real Future of Quantum Computing? - IEEE Spectrum [Last Updated On: October 13th, 2017] [Originally Added On: October 13th, 2017]
- quantum computing - engadget.com [Last Updated On: October 13th, 2017] [Originally Added On: October 13th, 2017]
- Quantum computing - news.microsoft.com [Last Updated On: November 1st, 2017] [Originally Added On: November 1st, 2017]
- IBM's processor pushes quantum computing ... - engadget.com [Last Updated On: November 16th, 2017] [Originally Added On: November 16th, 2017]
- Yale Professors Race Google and IBM to the First Quantum ... [Last Updated On: November 16th, 2017] [Originally Added On: November 16th, 2017]
- Quantum Computing Is the Next Big Security Risk | WIRED [Last Updated On: December 8th, 2017] [Originally Added On: December 8th, 2017]
- Microsoft offers developers a preview of its quantum ... [Last Updated On: December 12th, 2017] [Originally Added On: December 12th, 2017]
- New silicon structure opens the gate to quantum computers [Last Updated On: December 14th, 2017] [Originally Added On: December 14th, 2017]
- Quantum Computing Explained | What is Quantum Computing? [Last Updated On: December 21st, 2017] [Originally Added On: December 21st, 2017]
- What is Quantum Computing? | SAP News Center [Last Updated On: December 23rd, 2017] [Originally Added On: December 23rd, 2017]
- Is Quantum Computing an Existential Threat to Blockchain ... [Last Updated On: December 25th, 2017] [Originally Added On: December 25th, 2017]
- IBM puts its quantum computer to work in relaxing, nerdy ASMR ... [Last Updated On: January 8th, 2018] [Originally Added On: January 8th, 2018]
- Quantum computing is going to change the world. Here's what ... [Last Updated On: January 8th, 2018] [Originally Added On: January 8th, 2018]
- The Era of Quantum Computing Is Here. Outlook: Cloudy ... [Last Updated On: January 26th, 2018] [Originally Added On: January 26th, 2018]
- What is quantum computing? - Definition from WhatIs.com [Last Updated On: February 5th, 2018] [Originally Added On: February 5th, 2018]
- Senate bills would make quantum computing a priority [Last Updated On: June 10th, 2018] [Originally Added On: June 10th, 2018]
- Two Quantum Computing Bills Are Coming To Congress [Last Updated On: July 5th, 2018] [Originally Added On: July 5th, 2018]
- Quantum Computing Market Research Report- Forecast 2022 | MRFR [Last Updated On: August 1st, 2018] [Originally Added On: August 1st, 2018]
- What Is Quantum Computing? The Complete WIRED Guide | WIRED [Last Updated On: August 22nd, 2018] [Originally Added On: August 22nd, 2018]
- Quantum Computing | USRA [Last Updated On: August 30th, 2018] [Originally Added On: August 30th, 2018]
- The quantum computing race the US cant afford to lose [Last Updated On: September 3rd, 2018] [Originally Added On: September 3rd, 2018]
- The reality of quantum computing could be just three years ... [Last Updated On: September 12th, 2018] [Originally Added On: September 12th, 2018]
- US takes first step toward a quantum computing workforce ... [Last Updated On: September 17th, 2018] [Originally Added On: September 17th, 2018]
- China bet big on quantum computing. Now the ... - money.cnn.com [Last Updated On: September 17th, 2018] [Originally Added On: September 17th, 2018]
- China bet big on quantum computing. Now the US races to ... [Last Updated On: October 26th, 2018] [Originally Added On: October 26th, 2018]
- A new type of quantum computer has smashed every record ... [Last Updated On: December 21st, 2018] [Originally Added On: December 21st, 2018]
- IBM unveils its first commercial quantum computer [Last Updated On: January 9th, 2019] [Originally Added On: January 9th, 2019]
- IBM thinks outside of the lab, puts quantum computer in a box [Last Updated On: January 11th, 2019] [Originally Added On: January 11th, 2019]
- Quantum Computing | The MIT Press [Last Updated On: January 11th, 2019] [Originally Added On: January 11th, 2019]
- CES 2019: IBM's Q System One Is the Rock Star Quantum ... [Last Updated On: January 13th, 2019] [Originally Added On: January 13th, 2019]